In the air filter maintenance, carefully check the inside surface of the filter paper filter color and contrast. Used cores, contact the outer surface of the atmospheric side by dust, sedimentary color showed gray; While facing the inlet side of the surface should still present within the filter paper is ecru. If the dust removal of the filter core appearance, the filter can manifest themselves, the filter can continue to use. When filter outside surface after removing dust, the paper after themselves, or filter appeared no longer inside surface color hair and dark, the filter must change.
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